The paper shows the analytictal results obtained from the archaeometric study carried out on a Roman sarcophagus, known today as the tomb of King Ramiro II of Aragon, called “the Monk”. Non-destructive spectrophotometric colour testing, petrography, cathodoluminiscence (CL microfacies and quantitative CL) and C-O isotopic techniques were applied in order to investigate its marble provenance. […]